Steam boiler



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J. S. ANDREWS STEAM BOILER Original Filed Feb. '12. 1917 3 Sheets-Sheet1 msma June 1, R923 J. S. ANDREWS STEAM BOILER Original Filed Feb. 12.1917 3 Sheets-Sheet 2 June 19, 11923. 1,45%4

J. 5. ANDREWS STEAM BO ILER Original Fi'led Feb. 12. 1917 s Sheets-Sheet5 IIHI I F 6 11 5 I? J a" I h awwwtoz wow Q13 Patented June 19, 19231.

JOHN s. ANDREWS,

intact rare.

OF GARY, INDIANA.

STEAM BOILER.

Application filed February 12,1917, Serial To all whom it may concern:

Be it known that 1, JOHN S. Anminws, a citizen of the United States,residing at the city of Gary, in the county of Lake and State ofIndiana, have invented certain new and useful Improvements in SteamBoilers, of which the following is aspecification.

My invention relates to the construction of boilers which are used forthe production of steam for industrial and other purposes. Underordinary conditions and as usually constructed. there is, as is wellknown, a considerable loss of the heating power of the fuel, and acorresponding production of of smoke through loss of unused fuel gases.It is the object of my invention to provide means by which greatereconomy of fuel values is obtained, by which the production of smoke iseliminated or largely done away with, and by which the steaming capacityof a boiler may be considerably increased as compared with a boiler notprovided with my improvements. Such improvements may be used inconnection with fire box boilers or with the tubular boilers which arein common use, and may be not only applied to them in the construction,but is adapted to be added to such boilers after construction as a meansof increasing their capacity and of economizing fuel and eliminatingsmoke as stated.

The principles of my invention are illustrated in the drawings, in whichthe same is shown as applied to a fire box boiler,

Fig. 1 represents a cross section of such boiler on the dotted line l-1of Fig. 3;

Fig. 2 is an enlarged vertical section of my improvement on the dottedline 22 of Fig. 1; i

Fig. 3 is a vertical section on the dotted line 3- -3 of Fig. 1;

Fig. 4 is an enlarged top view of a portion of my improvement on thedotted line 4l-4L of Fig. 1. I

Figure 5 is a front view of my invention in which the front and rearmembers are of unitary construction; and

Figure 6 shows a horizontal sectional view of the device shown in Figure1.

Further, describing my invention with reference to the drawings in whichlike characters of reference denote like parts throughout: 1 is a brickwall upon which is supported a boiler having the shell 2, in which is afire box with the side walls 3, 8, crown sheet l," and provided withflues5 leading from the No. 147,988. Renewed November 17, 1922.

rear portion of the fire box in the usual manner; 6, 6 being the gratebars by which the fuel supported. Transversely of the fire box 1 providea depending fire wall having a rear member '7 which may be unitary asshown in Figure 5 Or which may comprise a plurality of sections orelements 7 overhanging the grate and so attached that the upper portionsthereof are in closed relation to the crown sheet. Said fire wall alsohas a front member 8 which may be unitary as shown in Figure 5 or whichmay comprise elements 8 supported at a distance from the crown sheet toprovide an opening for the passage of gases from the front. part of thefire box and spaced from the rearmember to provide a down flue 9connecting at its lower end with the rear part of the fire box. The saidelements which together make a fire wall depending over the grate, orwhat might otherwise be described as a battle, should be hollow and maybe formed as shown in Fig, 2, by a plurality of sheets 11, 11 and 12, 12secured together at the top, bottom and ends by strips 13, havingflanges by which they may be riveted to the plates in the usual manner aof boiler construction. Any spaces between the ends of members 7 and 8and the sides of the fire box and the top of 7 and the crown sheetshould be filled as at 17 and 18 by fire clay or other refractorymaterial so that no opportunity is afforded for passage of gases therebyexcept as hereinafter explained. Communication is made between theinterior of the said members and the interior of the boiler by means ofthe tubular connections 14, which are carried to the crown sheet, andsimilar connections 15 which are carried through the side walls of thefire box. The elements of the front and rear members are connected witheach other by pipes 16, so as to give free circulation of water betweeneach other and the boiler. Burning of the plates, of which the dependingwall is constructed, is thereby prevented, while a considerablyincreased steaming capacity is added to the boiler.

In practical use when a fire box is equipped as described with myimprovement the fire is built upon the grate bars 6 in the usual manner,so that the fuel forms a bed, the top of which is closely adjacent tothe lower edges of the hanging fire wall formed as above described. Whenadditional fuel is added it will cover the space between such wall andthe door.

As the smoke and the form.

free gases of combustion are given off, they pass upwardly and betweenthe crown sheet and the top of the front member of the depending firewall, and thence through the down flue between the two members asinclicated by the arrows, thereby coming in contact with the surface ofthe heated coal body where they are completely consumed. As thecombustion proceeds and the fuel is more or less coked it will fallforwardly into the more highly heated area under and beyond the saidhanging wall, which action should be aided in the process of firing,thereby maintaining the bright fire and the high heat of that section ofthe fire box. Space is thus afforded into which additional quantities offresh fuel are supplied from time to time as needed, where it is co kedand the distilled gases are given off to be passed to the front of thefire box as hercinbefore explained.

I have described my invention with reference to a fire box boiler, andone in which my improvements have been added after the same was fullyconstructed. F or convenien'ce in attachment the front and rearportionsof the fire wall are each shown as comprising two separatestructures or sections. h-en used in connection with new constructionsuch portions may be made in unitary But, whether made in one or moresections the principle of operation is the same and such constructionsare to be held equivalent and so understood throughout the specificationand claims. It is also evident that: my improvements may be applied todifferent forms of boilers aswell as tonew ones: in course ofconstruction, so that the form, connections and means of attachment maybe greatly varied according to the necessities of the particular casewithout departing from the essential principles involved.

I claim:

1. A fire wall for boilers including a front and arear hollow member,tubular means at the upper and lower portions of said memhere fordirectly interiorly connecting them together and spacing them from eachother to-form a down draft flue therebetween', said front member beingarranged to allow fuel gases to pass the same at the upper end thereof,said fire wall being provided with devices to interiorly connect theinterior thereof with the interior of a boiler.

2. A fire wall for boilers including a front and a rear hollow member,tubular means at the upper and lower portions of said members fordirectly interiorly connecting them together and spacing them from eachother to form a substantially vertical down draft" flue therebetween,said front member having its upper end lower than the upper end of saidrear'member, and one of said membersbeing provided with devices atdifferent vertical points thereof to interiorly connect the same withthe interior of aboiler.

3. A furnace structure having a boiler, fire box, and ash pit, adepending bafiie wall structure dividing the fire-box into a frontfiring chamber and a rear combustion chamher and extending downwardly tothe normal top level of the fuel, a grate underneath the fire box, saidbaffle wall including a hollow rear member extended to the top of andacross the fire box, a hollow front member spaced from the rear memberand from the top of the fire box to form a down flue therebetween,tubular connections providing direct fluid connection between theinterior of said front and rear members, and means providing a fluidconnection between one of said members and the interior of the boiler.

4-. A furnace structure having a boiler, fire box, and ash pit, adepending bafiie wall structure dividing the fire-box into a frontfiring chamber and a rear combustion chamher and extending downwardly tothe normal top level of the fuel, a grate underneath the fire box, saidbafiie wall including a. hollow rear member having its top and ends inclosed relation to the fire box, a hollowfront member havingits ends inclosed relation to the fire box and spaced from the rear member and fromthe top of the fire box to form a down flue between said members,tubular connections providing water communication between said front andrear members, and means connecting the interior of said bafile wall withthe interior of the boiler.

5. A furnace structure having a boiler, fire box, and ash pit, adepending baffle wall structure dividing the firebox into a front firingchamber and a rear combustion chamber and extending downwardly to thenormal top level of the fuel, a grate underneath t'hefire box, saidbaffle, wall including a rear member in closed relation to the top ofand extended across the fire box, said rear member comprising aplurality of independent hollow elements, a front member spaced from therear member and from the top of the fire box to form a down flue betweenthe same and the rear member, said front member comprising a pluralityof independent hollow elements, tubular connections" providing watercommunication between said front and rear members, and tubular meansconnecting the interior of said baflie wall with the interior of theboiler.

6. A furnace structure having a boiler, fire box, and ash pit, adepending bailiewall structure dividing, the fire-box into afront firingchamber and a rear combustion chamber and extending downwardly to thenormal top level of the fuel, a grate underneath the fire box, saidbaffle wall having a hollow rear'member comprising a plurality ofelements in closed relation to the top of the fire box and extendedthereacross, a hollow front member comprising a. plurality of elementsspaced from the rear member and from the top of the fire box to form adown fiue between said front and rear mem bers, and tubular connectionsproviding a circulatory water communication between all of said elementsand the interior of the boiler.

7. A furnace structure having a boiler, fire box, and ash pit, adepending baffle wall structure dividing the fire-box into a frontfiring chamber and a rear combustion chamber and extending, downwardlyto the normal top level of thefuel, a grate underneath the fire box,said baffle wall comprising a hollow rear member and a hollow frontmember connected with and spaced from each other so that the upper edgeof the front member is lower than the upper edge of said rear member,means to directly 1nteriorly connect said members, and tubular devicesassociated with said bafiie wall to interiorly connect the same with theinterior of the boiler. y

S. A furnace structure having a boiler, fire box, and ash pit, adepending bafiie wall structure dividing the fire-box into a frontfiring chamber and a rear combustion chamber and extending downwardly tothe normal top level of the fuel, a grate under,- ueath the fire box,said baffle wall including a hollow rear member having a closed upperend in closed relation with the top of the fire box, a hollow frontmember directly interiorly connected to and spaced from the rear memberby tubular connections to form a down draft flue therebetween, saidfront member being arranged with its upper end lower than the upper endof said rear member, and tubular devices associated with said bafflewall at different levels thereof to interiorly connect the same with theinterior of the boiler.

9. A furnace structure having a boiler, fire box, and ash pit, adepending baffle wall structure dividing the fire-box into a frontfiring chamber and a rear combustion chamber and extending downwardly tothe normal top level of the fuel, a grate underneath the fire box, saidbaffle wall including a hollow rear member having a closed upper end inclosed relation with the top of the fire box, a hollow front memberspaced from the rear member to form a down draft fiue therebetween,means directly interiorly connecting said front and rear members, anddevices interiorly connecting one of said members with the interior ofthe boiler.

10. A furnace structure having afboiler, fire box, and ash pit, adepending baffle wall structure dividing the fire-box into a frontfiring chamber and a rear combustion chamber and extending downwardly tothe normal top level ofthe fuel, a grate underneath the fire box, saidbaflie wall including a front and a. rear hollow, member, tubular meansat the upper and lower portions of said members directly interiorlyconnecting them to and spacing them from each other to form a down draftfiue therebetween, said front memberbemg arranged to fire box, and ashpit, a depending bafile wall structure dividing the fire-box into afront firing chamber and a rear combustion chamber and extendingdownwardly to the normal top level of the fuel, a grate underneath thefire box, said baffle wall comprising a unitary hollow attachment closedat the ends and having tubular connections attached tothe boiler toprovide a single circulation of water through the attachment or bafflewall, said bafiie wall being positioned in thefire box to provide a downdraft passageway for the hot fuel gases in passing from the fire box tothe combus tion chamber. l

12. A furnace structure having a boiler, fire box, and ash pit, adepending baffle wall structure dividing the fire-box into a frontfiring chamber and a rear combustion cham ber and extending downwardlyto the normal top level of the fuel, a grate underneath the fire box,said baffie wall including a hollow front member'having closed ends anda hollow rear member having closed ends and directly interiorlyconnected together and spaced from each other to form a down draftpassageway therebetween, means connected with the upper part of saidfire wall to interiorly connect the same with the up- 7 per part of theboiler and means connected with the lower part of said fire wall tointeriorly connect the same with a. lower part of the boiler.

13. A furnace structure having a boiler, fire box, and ash pit, adepending baffle wall structure dividing the fire-box into a frontfiring chamber and a rear combustion chamber and extending downwardly tothe normal top level of the fuel, a grate underneath the fire box, saidbaffle wall including a hollow rear member in; closed relation to thetop of the fire box and extended thereacross, a hollow front memberspaced from the rear member and from the top of the fire box to form a.down draft fiue between said members, and tubular connections providinga circulatory water communication between both of saidmembers and theinterior of the boiler.

1a. A furnace structure having a boiler, fire box, and ash pit, adepending b-afiie wall structure dividing the fire-box into a frontfiring chamber and a rear combination chamber and extending downwardlyto the normal top level of the fuel, a. grate underneath the fire box,said baffle Well being in the form of a. Water circulated fire Wallattachment and comprising 211 hollow unitary I structure with a downdraft passageway therethrough, and means de'tachably operatively'connecting the interior of said struc-

